Branchinecta mackini Dexter, 1956 (Crustacea, Anostraca) has been thought to occur both east and west of the Continental Divide of North America for more than 30 years. My study revealed that individuals from east of the Divide are morphologically distinct from those found west of the Divide. Males consistently differed in the shape of the distal end of the antenna. The eastern taxon is described and given the name Branchinecta readingi new species.
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Vol. 20 • No. 3